The entities which are involved to this system are as follows.
1. 1.Librarian
Librarian has some tasks like entering the books, entering reader data,
editing data of books, charging delay fees, checking the issued books, check
whether who owes the books & etc.
2. 2.Readers
The reader has to do some tasks like checking the books that which has
borrowed earlier, checking the delay fee, transaction of online payments,
changing the data of the profile, donating books and etc.
3. 3.Admin
Admin has some tasks as the librarian has & also removing the books
from the stock, checking the payment & changing the payments also, changing
the librarian and etc. These are the entities that has this system.
The
attributes which define the entities are as follows. The entity which is books
has attributes like name, ID, author, enter date, quantity & etc. And also
the entity which is readers has attributes as ID, name, email, password &
etc. The supplier has attributes like ID, name =, email, payments. The
attributes which re belonged to the entity librarian are ID, name, email &
etc. The entity, issued book has attributes as ID, Reader name, Book name, Date
issued, Issued by & etc. The payments entity has ID, Payment, region &
date as it’s attributes.
The
relationship among the entities are as follows. The attribute, name in the
entity, books has the relationship between name of the entity, supplier. And
also both those attributes has relationship with the attribute, reader name
which belongs to book entity.
Another relationship among the entities are as
follows. The attribute, name in the entity, reader has the relationship between
reader name of the entity, issued book. And also, both those attributes have
relationship with the attribute, reader which belongs to delay fee entity.
